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Open AccessArticle

Influence of Preharvest Gibberellic Acid Treatments on Postharvest Quality of Minimally Processed Leaf Lettuce and Rocket

Dipartimento Scienze Agrarie, Alimentari e Forestali, Università di Palermo, Viale delle Scienze 4, 90128 Palermo, Italy
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Horticulturae 2019, 5(3), 63; https://doi.org/10.3390/horticulturae5030063
Received: 10 June 2019 / Revised: 19 August 2019 / Accepted: 23 August 2019 / Published: 2 September 2019
Plant growth regulators are used in high-value vegetable crops during cultivation and after harvest to increase yield, enhance crop management, and improve or retain the produce quality. The aim of this work was to evaluate the quality characteristics during cold storage of minimally processed leaf lettuce and rocket, obtained from plants grown in a hydroponic floating system with mineral nutrient solutions (MNS) containing different levels of gibberellic acid (GA3). Plants were grown in greenhouse conditions on nutrient solutions containing 0, 10−8, and 10−6 M GA3. At harvest, lettuce and rocket were immediately processed as fresh-cut vegetables and stored for 21 d at 4 °C. After processing, weight loss, total soluble solids, titratable acidity, ascorbic acid and nitrate content, leaf color characteristics, and overall quality were evaluated. Adding 10−6 M GA3 to the MNS of a floating system significantly increased the yield of leaf lettuce and rocket plants and of minimally-processed leaves. In addition, preharvest GA3 treatments had positive effects on delaying senescence and enhancing shelf-life of minimally processed lettuce and rocket. The slowed senescence of GA3-treated samples maintained an overall quality over the threshold of marketability in both lettuce and rocket for up to 21 d of cold storage. View Full-Text
Keywords: postharvest; minimally processed vegetables; gibberellic acid; GA3; hydroponics; floating system; leafy vegetables; leaf lettuce; rocket; nitrate content; ascorbic acid; shelf life postharvest; minimally processed vegetables; gibberellic acid; GA3; hydroponics; floating system; leafy vegetables; leaf lettuce; rocket; nitrate content; ascorbic acid; shelf life
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Miceli, A.; Vetrano, F.; Sabatino, L.; D’Anna, F.; Moncada, A. Influence of Preharvest Gibberellic Acid Treatments on Postharvest Quality of Minimally Processed Leaf Lettuce and Rocket. Horticulturae 2019, 5, 63.

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